to house, house in a castle, keep in a castle
1839, Félix González de León, Noticia historica del origen de los nombres de las calles de esta M.N.M.L.Y.M.H. ciudad de Sevilla:En esta época cada familia se acastillaba en sus casas y aun en los templos (como ya he referido en otros lugares de esta obra) ó cuyo fin fabricaban estas torres, y las guarnecian de armas.At this time, each family was housed in their homes and even in the temples (as I have already mentioned elsewhere in this work) or for whose purpose these towers were manufactured, and they were equipped with weapons.
(transitive) to castellate, incastellate, to make into a castle, to build in the form of a castle or to add battlements to an existing building
1785, Gaspar de Molina y Saldívar, Reflexiones sobre la arquitectura, ornato y musica del templo, page 326:Llaman acastillar colocar la cañonería de modo, que los cañones mas largos ocupen el medio, y disminuyan hácia los extremos.They call castellation the placing of the cannons so that the longer cannons occupy the middle, and decrease toward the ends.
1942, Luis Enrique Azarola Gil, Apellidos de la patria vieja, page 176:Se acastilló en las virtudes y costumbres tradicionales, y fundó su hogar en unión de doña Pilar Carro, hija del capitán Juan Carro y de doña Rosa Costales, con descendencia: […] He settled down in traditional virtues and customs, and founded his home together with Doña Pilar Carro, daughter of Captain Juan Carro and Doña Rosa Costales, and offspring: […]
(intransitive) to take the form of a castle
